Rabbits can have HUGE litters. You may want to foster off a couple of the kits if she has over 8, because the smallest or weakest may not survive(rabbits only have 8 nipples). To foster, just put rabbits of similar age in with another litter or rabbits of similar age(within a day or two). You may want to run a little vanilla extract on the doe's nose, but that is not usually neccessary.
After having a doe have a litter of 11 with a runt that couldn't compete to nurse, I try to time it so two does kindle at the same time just in case I need to foster kits to the other doe. It's saved several kits' lives to date.
I raise several breeds of rabbits, and they're pastured in tractors. They eat the salad bar provided by the pastures, supplemented with rabbit pellets from the local feed mill. Right now, they're also enjoying the fallen leaves. Does about to kindle are brought inside and raise their kits inside until they're about 6 weeks old, when they're generally weaned by the doe. The does are fed greens from the pastures before they kindle, after they kindle while the kits are nursing, and the kits start eating greens in addition to the pellets and alfalfa hay when they're a few weeks old. By the time they're weaned, they transition to the tractor and foraging without problem (they're also fed supplemental pellets). My rabbits are healthy, active, and enjoy fresh air and sunshine in their tractors...and they mow the lawn.
I've heard from people who use the wood slats on the bottom that they've had escapes - our tractor bottoms are covered in 2"x4" wire. They can still eat grass through it (and dig to a limited extent), but there have been zero escapes and no attempts by predators. An escapee out here would be unlikely to survive for long.
